Question

我正在使用模型管理器返回经过过滤的搜索查询集，但是目前该样板很长，如果能够找到一种减少样板并获得一些性能的方法，我将感到非常高兴。

目前，我正在这样做：

class ImageTagManager(models.Manager):
    def ordered_images(self):
        queryset = self.model.objects.order_by('id').all()
        return queryset

    def search(self, query_dict):

        if isinstance(query_dict, list):
            queryset = ImageTag.objects.filter(id__in=query_dict)
            if queryset is not None:
                return queryset
            else:
                return False

        # Initially getting all objects
        queryset_initial = ImageTag.objects.all()

        # copying queryset_initial to filter
        queryset = queryset_initial

        queryset = queryset.filter(company__iexact=query_dict['company']) if query_dict.get('company') not in (
            None, '') else queryset
        queryset = queryset.filter(accoff__iexact=query_dict['accoff']) if query_dict.get('accoff') not in (
            None, '') else queryset
        queryset = queryset.filter(section__iexact=query_dict['section']) if query_dict.get('section') not in (
            None, '') else queryset
        queryset = queryset.filter(docref__iexact=query_dict['docref']) if query_dict.get('docref') not in (
            None, '') else queryset

        start_date = query_dict.get('start_date')
        end_date = query_dict.get('end_date')

        if start_date not in (None, '') and end_date not in (None, '') and start_date < end_date:
            queryset = queryset.filter(start_date__range=(start_date, end_date))
        elif start_date not in (None, ''):
            queryset = queryset.filter(start_date__exact=start_date) if query_dict.get('docref') not in (
                None, '') else queryset

        queryset = queryset.filter(pagenum__iexact=query_dict['pagenum']) if query_dict.get('pagenum') not in (
            None, '') else queryset
        queryset = queryset.filter(refnum__iexact=query_dict['refnum']) if query_dict.get('refnum') not in (
            None, '') else queryset
        queryset = queryset.filter(pernum__iexact=query_dict['pernum']) if query_dict.get('pernum') not in (
            None, '') else queryset
        queryset = queryset.filter(attr1__iexact=query_dict['attr1']) if query_dict.get('attr1') not in (
            None, '') else queryset
        queryset = queryset.filter(attr2__iexact=query_dict['attr2']) if query_dict.get('attr2') not in (
            None, '') else queryset
        queryset = queryset.filter(attr3__iexact=query_dict['attr3']) if query_dict.get('attr3') not in (
            None, '') else queryset
        queryset = queryset.filter(attr4__iexact=query_dict['attr4']) if query_dict.get('attr4') not in (
            None, '') else queryset
        queryset = queryset.filter(attr5__iexact=query_dict['attr5']) if query_dict.get('attr5') not in (
            None, '') else queryset

        if len(query_dict.get('tags')) > 0:
            tags = query_dict['tags']
            queryset = queryset.filter(tags__name__in=[tags])

        if queryset != queryset_initial:
            return queryset
        else:
            return []

基本上，搜索将首先获取所有记录，然后根据通过query_dict（Form）传递的搜索条件对其进行过滤。返回结果查询集。

Answer 1

根据@Endre Both的评论，我设法遍历了过滤条件，发现处理列表条件并单独处理它有点困难，我的方式是：

    def search(self, query_dict):

        searched_for = {}
        for key in query_dict:
            if query_dict[key] not in (None, ''):
                if isinstance(query_dict[key], list):
                    pass
                else:
                    searched_for[key] = query_dict[key]
                # print(key)

        # Initially getting all objects
        queryset_initial = ImageTag.objects.all()

        # filtering based on non list criteria
        queryset = queryset_initial.filter(**searched_for)

        # filtering based on list criteria
        if query_dict['tags'] not in (None, ''):
            if len(query_dict['tags']) > 0:
                queryset.filter(tags__name__in=query_dict['tags'])

        if queryset != queryset_initial:
            return queryset
        else:
            return []

如果有人有更好的方法，如果能与我分享，我将不胜感激。

Django-减少用于过滤查询集的样板并可能提高性能

1 个答案: